Even if your images are found on google images this does not mean they are 'public domain' images and subsequently are okay for people to use.

Think about it: Google images do not host your images it shows then then links to the page they are found on. This means that regardless of them 'being found on google images' to use the images you must check individual copyright statuses for the photos. However, this does not mean to say that there aren't images on Google which are considered public domain.

Spefically for commercial reuse (ie, using as promotion or as 'styles I can make') there is a grand total of 1 photo under the search 'dreadlock extensions' using Google's commerical reuse search restriction.

Feel free to try it yourself.

Edit: it is also possible to file copyright infringement with Google Images if you find another website hosting your images. Proof that you do have to check copyrights before trying to use an image you find.